Last week I had my truck in for recalls.

They reprogrammed the occupant restraint module, and replaced Brake Transmission Interlock and programmed BCM for it.

They also reprogrammed the ABS module and installed a water pump for recalled one.

Now when I start the truck in cold temps, it does not go thru the diesel pre-heat.

It just instantly starts when I push the start button.

Is this a programming issue, or did they unplug the grid heater when doing the water pump or something?

I know many delete the grid heater all together but mine is still there.

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